I've seen other similar questions here and here but neither of those worked for me.
I'm on a mac and simply installed ember cli using npm and I thought it would work out of the box. Here is the server output:
version: 0.1.4
Could not find watchman, falling back to NodeWatcher for file system events
Livereload server on port 35729
Serving on http://0.0.0.0:4200/
Build successful - 2456ms.
Slowest Trees | Total
-------------------------------+----------------
EsnextFilter | 877ms
TreeMerger | 380ms
Concat | 375ms
JSHint - Tests | 178ms
EsnextFilter | 146ms
ES6Concatenator | 135ms
I wasn't the only one with this issue and my friend found a solution that works.
Add the following lines to your .ember-cli in the root of your project:
"liveReload": true,
"watcher": "polling"
Once you restart the server, it should watch for changes to your directory.